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path: root/drivers/irqchip/irq-vt8500.c
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Diffstat (limited to 'drivers/irqchip/irq-vt8500.c')
-rw-r--r--drivers/irqchip/irq-vt8500.c184
1 files changed, 87 insertions, 97 deletions
diff --git a/drivers/irqchip/irq-vt8500.c b/drivers/irqchip/irq-vt8500.c
index 1846e7d66681..3b742590aec8 100644
--- a/drivers/irqchip/irq-vt8500.c
+++ b/drivers/irqchip/irq-vt8500.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* arch/arm/mach-vt8500/irq.c
*
* Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz>
* Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
@@ -27,6 +14,8 @@
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/chained_irq.h>
#include <linux/irqdomain.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
@@ -39,8 +28,6 @@
#include <asm/exception.h>
#include <asm/mach/irq.h>
-#include "irqchip.h"
-
#define VT8500_ICPC_IRQ 0x20
#define VT8500_ICPC_FIQ 0x24
#define VT8500_ICDC 0x40 /* Destination Control 64*u32 */
@@ -77,29 +64,28 @@ struct vt8500_irq_data {
struct irq_domain *domain; /* Domain for this controller */
};
-/* Global variable for accessing io-mem addresses */
-static struct vt8500_irq_data intc[VT8500_INTC_MAX];
-static u32 active_cnt = 0;
+/* Primary interrupt controller data */
+static struct vt8500_irq_data *primary_intc;
-static void vt8500_irq_mask(struct irq_data *d)
+static void vt8500_irq_ack(struct irq_data *d)
{
struct vt8500_irq_data *priv = d->domain->host_data;
void __iomem *base = priv->base;
void __iomem *stat_reg = base + VT8500_ICIS + (d->hwirq < 32 ? 0 : 4);
- u8 edge, dctr;
- u32 status;
+ u32 status = (1 << (d->hwirq & 0x1f));
- edge = readb(base + VT8500_ICDC + d->hwirq) & VT8500_EDGE;
- if (edge) {
- status = readl(stat_reg);
+ writel(status, stat_reg);
+}
- status |= (1 << (d->hwirq & 0x1f));
- writel(status, stat_reg);
- } else {
- dctr = readb(base + VT8500_ICDC + d->hwirq);
- dctr &= ~VT8500_INT_ENABLE;
- writeb(dctr, base + VT8500_ICDC + d->hwirq);
- }
+static void vt8500_irq_mask(struct irq_data *d)
+{
+ struct vt8500_irq_data *priv = d->domain->host_data;
+ void __iomem *base = priv->base;
+ u8 dctr;
+
+ dctr = readb(base + VT8500_ICDC + d->hwirq);
+ dctr &= ~VT8500_INT_ENABLE;
+ writeb(dctr, base + VT8500_ICDC + d->hwirq);
}
static void vt8500_irq_unmask(struct irq_data *d)
@@ -127,15 +113,15 @@ static int vt8500_irq_set_type(struct irq_data *d, unsigned int flow_type)
return -EINVAL;
case IRQF_TRIGGER_HIGH:
dctr |= VT8500_TRIGGER_HIGH;
- __irq_set_handler_locked(d->irq, handle_level_irq);
+ irq_set_handler_locked(d, handle_level_irq);
break;
case IRQF_TRIGGER_FALLING:
dctr |= VT8500_TRIGGER_FALLING;
- __irq_set_handler_locked(d->irq, handle_edge_irq);
+ irq_set_handler_locked(d, handle_edge_irq);
break;
case IRQF_TRIGGER_RISING:
dctr |= VT8500_TRIGGER_RISING;
- __irq_set_handler_locked(d->irq, handle_edge_irq);
+ irq_set_handler_locked(d, handle_edge_irq);
break;
}
writeb(dctr, base + VT8500_ICDC + d->hwirq);
@@ -144,11 +130,11 @@ static int vt8500_irq_set_type(struct irq_data *d, unsigned int flow_type)
}
static struct irq_chip vt8500_irq_chip = {
- .name = "vt8500",
- .irq_ack = vt8500_irq_mask,
- .irq_mask = vt8500_irq_mask,
- .irq_unmask = vt8500_irq_unmask,
- .irq_set_type = vt8500_irq_set_type,
+ .name = "vt8500",
+ .irq_ack = vt8500_irq_ack,
+ .irq_mask = vt8500_irq_mask,
+ .irq_unmask = vt8500_irq_unmask,
+ .irq_set_type = vt8500_irq_set_type,
};
static void __init vt8500_init_irq_hw(void __iomem *base)
@@ -168,94 +154,98 @@ static int vt8500_irq_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
irq_set_chip_and_handler(virq, &vt8500_irq_chip, handle_level_irq);
- set_irq_flags(virq, IRQF_VALID);
return 0;
}
-static struct irq_domain_ops vt8500_irq_domain_ops = {
+static const struct irq_domain_ops vt8500_irq_domain_ops = {
.map = vt8500_irq_map,
.xlate = irq_domain_xlate_onecell,
};
-static asmlinkage
-void __exception_irq_entry vt8500_handle_irq(struct pt_regs *regs)
+static inline void vt8500_handle_irq_common(struct vt8500_irq_data *intc)
{
- u32 stat, i;
- int irqnr, virq;
- void __iomem *base;
-
- /* Loop through each active controller */
- for (i=0; i<active_cnt; i++) {
- base = intc[i].base;
- irqnr = readl_relaxed(base) & 0x3F;
- /*
- Highest Priority register default = 63, so check that this
- is a real interrupt by checking the status register
- */
- if (irqnr == 63) {
- stat = readl_relaxed(base + VT8500_ICIS + 4);
- if (!(stat & BIT(31)))
- continue;
- }
-
- virq = irq_find_mapping(intc[i].domain, irqnr);
- handle_IRQ(virq, regs);
+ unsigned long irqnr = readl_relaxed(intc->base) & 0x3F;
+ unsigned long stat;
+
+ /*
+ * Highest Priority register default = 63, so check that this
+ * is a real interrupt by checking the status register
+ */
+ if (irqnr == 63) {
+ stat = readl_relaxed(intc->base + VT8500_ICIS + 4);
+ if (!(stat & BIT(31)))
+ return;
}
+
+ generic_handle_domain_irq(intc->domain, irqnr);
+}
+
+static void __exception_irq_entry vt8500_handle_irq(struct pt_regs *regs)
+{
+ vt8500_handle_irq_common(primary_intc);
+}
+
+static void vt8500_handle_irq_chained(struct irq_desc *desc)
+{
+ struct irq_domain *d = irq_desc_get_handler_data(desc);
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ struct vt8500_irq_data *intc = d->host_data;
+
+ chained_irq_enter(chip, desc);
+ vt8500_handle_irq_common(intc);
+ chained_irq_exit(chip, desc);
}
static int __init vt8500_irq_init(struct device_node *node,
struct device_node *parent)
{
- int irq, i;
- struct device_node *np = node;
+ struct vt8500_irq_data *intc;
+ int irq, i, ret = 0;
- if (active_cnt == VT8500_INTC_MAX) {
- pr_err("%s: Interrupt controllers > VT8500_INTC_MAX\n",
- __func__);
- goto out;
- }
-
- intc[active_cnt].base = of_iomap(np, 0);
- intc[active_cnt].domain = irq_domain_add_linear(node, 64,
- &vt8500_irq_domain_ops, &intc[active_cnt]);
+ intc = kzalloc(sizeof(*intc), GFP_KERNEL);
+ if (!intc)
+ return -ENOMEM;
- if (!intc[active_cnt].base) {
+ intc->base = of_iomap(node, 0);
+ if (!intc->base) {
pr_err("%s: Unable to map IO memory\n", __func__);
- goto out;
+ ret = -ENOMEM;
+ goto err_free;
}
- if (!intc[active_cnt].domain) {
+ intc->domain = irq_domain_create_linear(of_fwnode_handle(node), 64,
+ &vt8500_irq_domain_ops, intc);
+ if (!intc->domain) {
pr_err("%s: Unable to add irq domain!\n", __func__);
- goto out;
+ ret = -ENOMEM;
+ goto err_unmap;
}
- set_handle_irq(vt8500_handle_irq);
-
- vt8500_init_irq_hw(intc[active_cnt].base);
+ vt8500_init_irq_hw(intc->base);
pr_info("vt8500-irq: Added interrupt controller\n");
- active_cnt++;
-
- /* check if this is a slaved controller */
- if (of_irq_count(np) != 0) {
- /* check that we have the correct number of interrupts */
- if (of_irq_count(np) != 8) {
- pr_err("%s: Incorrect IRQ map for slaved controller\n",
- __func__);
- return -EINVAL;
- }
-
- for (i = 0; i < 8; i++) {
- irq = irq_of_parse_and_map(np, i);
- enable_irq(irq);
+ /* check if this is a chained controller */
+ if (of_irq_count(node) != 0) {
+ for (i = 0; i < of_irq_count(node); i++) {
+ irq = irq_of_parse_and_map(node, i);
+ irq_set_chained_handler_and_data(irq, vt8500_handle_irq_chained,
+ intc);
}
pr_info("vt8500-irq: Enabled slave->parent interrupts\n");
+ } else {
+ primary_intc = intc;
+ set_handle_irq(vt8500_handle_irq);
}
-out:
return 0;
+
+err_unmap:
+ iounmap(intc->base);
+err_free:
+ kfree(intc);
+ return ret;
}
IRQCHIP_DECLARE(vt8500_irq, "via,vt8500-intc", vt8500_irq_init);
generated by cgit (git 2.34.1) at 2025-12-25 13:28:22 +0000